Music sharing service This Is My Jam has been in private beta for a while, but today the service opened its doors to all users. The idea is simple—when you sign up, you pick a song that you're in love with or that's just been in your head, and set it as your jam. Share it with friends, meet other people based on their jams, play them, leave a comment, follow them, and discover new tunes in a simple, fun to use webapp.

You can change your jams as often as you like, but you have to select a new one at least every seven days, which is when your jam will expire. Follow other users based on their music tastes, and the site will suggest some people you might like to follow based on your previous jams. If you sign up with your Twitter or Facebook account, the service will look to see if your friends are already signed up, and you can invite them if they're not. Before you select a new jam, you can choose to post the song to Twitter or Facebook, along with a link to your This Is My Jam profile where they can see and play the song.

I've been using This Is My Jam for a few months now, since it began its private beta. It's been a fun way to follow a lot of people and listen to a lot of music I wouldn't otherwise have discovered, and to share my favorite songs with the people who follow me. The service uses YouTube, SoundCloud, The Hype Machine, and others to pull audio tracks and music videos, so it's rare you'll search for a song and come up with no results, but picking the best result can be tricky. The real fun is that it's a non-cluttered, simple way to find and share music you like, with no worries about whether you own the song or have to upload anything, and for the moment, it's ad-free.